The primary signal is desiredSize on the controller. It can be positive (wants data), zero (at capacity), negative (over capacity), or null (closed). Producers are supposed to check this value and stop enqueueing when it's not positive. But there's nothing enforcing this: controller.enqueue() always succeeds, even when desiredSize is deeply negative.
;; import the memory from JS code
。爱思助手下载最新版本对此有专业解读
持续做好“土特产”这篇大文章，产业兴、农民富、乡村美的动人画卷必将在广袤田野不断铺展。
'They didn't listen, now we have to live with that'